# Cs–Te system

> Cs–Te system: 58 accepted literature values (crystal structure 22, invariant reaction 12, phase transition 10, formation 5) and 1 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote.

HTML: https://data.orchid-project.org/systems/CS-TE.html · Markdown: https://data.orchid-project.org/systems/CS-TE.md

58 accepted literature values from 1 paper(s) (experimental 43, model 11, unspecified 4); 1 calculated phase diagram(s). 10 further extracted value(s) not accepted by the reader-agreement checks are only in the JSON/CSV.

Data: [JSON](https://data.orchid-project.org/literature/systems/CS-TE.json) · [CSV](https://data.orchid-project.org/systems/CS-TE.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#CS-TE) · [interactive phase diagram](https://orchid-project.org/phase-diagrams/#CS-TE/CsTe-15Pha.json) · [phases (15)](https://data.orchid-project.org/phases/pages/CS-TE.html) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/CS-TE.html) · [Markdown](https://data.orchid-project.org/systems/CS-TE.md)

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| experimental | 43 |
| model | 11 |
| unspecified | 4 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| invariant reaction | 12 |
| phase transition | 10 |
| formation | 5 |
| heat capacity / entropy / enthalpy | 5 |
| activity / EMF / Gibbs energy | 2 |
| crystal structure | 22 |
| other property | 2 |

## Calculated phase diagrams

Binary phase diagrams calculated with pycalphad 0.11.2 from the SGTE binary collection (Hallstedt 2025, CC BY 4.0). Evidence class: model.

Table: Assessments with a calculated phase diagram

| TDB file | Assessment | SHA-256 | Links |
|---|---|---|---|
| CsTe-15Pha.tdb | T.-N. Pham Thi, J.-C. Dumas, V. Bouineau, N. Dupin, C. Gueneau, S. Gosse, P. Benigni, P. Maugis, J. Rogez, Calphad, 48, 1-12(2015). [doi:10.1016/j.calphad.2014.10.006](https://doi.org/10.1016/j.calphad.2014.10.006) | `ec9a78a5ef90701af86fc315b3f22a5d3d4bfd8d5d11fe34e1c81b0d55f549bd` | [viewer](https://orchid-project.org/phase-diagrams/#CS-TE/CsTe-15Pha.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/CsTe-15Pha.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/CsTe-15Pha.json) |

Table: Calculated three-phase invariants (model, mole fraction of the second component)

| TDB file | T (K) | Phases at the invariant |
|---|---:|---|
| CsTe-15Pha.tdb | 934.23 | CS2TE_HT (x(Te) 0.33333) + CS5TE3 (x(Te) 0.375) + ION (x(Te) 0.39286) |
| CsTe-15Pha.tdb | 934.23 | CS2TE_HT (x(Te) 0.33333) + CS5TE3 (x(Te) 0.375) + LIQUID (x(Te) 0.39286) |
| CsTe-15Pha.tdb | 895 | CS2TE_HT (x(Te) 0.33333) + CS2TE_LT (x(Te) 0.33333) + CS5TE3 (x(Te) 0.375) |
| CsTe-15Pha.tdb | 895 | ION (x(Te) 0.27208) + CS2TE_LT (x(Te) 0.33333) + CS2TE_HT (x(Te) 0.33333) |
| CsTe-15Pha.tdb | 729.16 | CS5TE3 (x(Te) 0.375) + ION (x(Te) 0.48225) + CSTE_B2 (x(Te) 0.4898) |
| CsTe-15Pha.tdb | 729.16 | CS5TE3 (x(Te) 0.375) + LIQUID (x(Te) 0.48225) + CSTE_B2 (x(Te) 0.4898) |
| CsTe-15Pha.tdb | 673.58 | CS5TE3 (x(Te) 0.375) + CSTE_LT (x(Te) 0.4898) + CSTE_B2 (x(Te) 0.4898) |
| CsTe-15Pha.tdb | 673.58 | CSTE_LT (x(Te) 0.4898) + CSTE_B2 (x(Te) 0.4898) + ION (x(Te) 0.5464) |
| CsTe-15Pha.tdb | 673.58 | CSTE_LT (x(Te) 0.4898) + CSTE_B2 (x(Te) 0.4898) + LIQUID (x(Te) 0.5464) |
| CsTe-15Pha.tdb | 648.26 | CSTE_LT (x(Te) 0.4898) + ION (x(Te) 0.55911) + CS2TE3 (x(Te) 0.6) |
| CsTe-15Pha.tdb | 648.26 | CSTE_LT (x(Te) 0.4898) + LIQUID (x(Te) 0.55911) + CS2TE3 (x(Te) 0.6) |
| CsTe-15Pha.tdb | 527.01 | CSTE4 (x(Te) 0.8) + ION (x(Te) 0.81258) + HEXAGONAL_A8 (x(Te) 1) |
| CsTe-15Pha.tdb | 527.01 | CSTE4 (x(Te) 0.8) + LIQUID (x(Te) 0.81258) + HEXAGONAL_A8 (x(Te) 1) |
| CsTe-15Pha.tdb | 508.54 | CS2TE3 (x(Te) 0.6) + CS2TE5 (x(Te) 0.71429) + ION (x(Te) 0.72903) |
| CsTe-15Pha.tdb | 508.54 | CS2TE3 (x(Te) 0.6) + CS2TE5 (x(Te) 0.71429) + LIQUID (x(Te) 0.72903) |
| CsTe-15Pha.tdb | 499.62 | CS2TE5 (x(Te) 0.71429) + LIQUID (x(Te) 0.74799) + CSTE4 (x(Te) 0.8) |
| CsTe-15Pha.tdb | 499.62 | CS2TE5 (x(Te) 0.71429) + ION (x(Te) 0.74799) + CSTE4 (x(Te) 0.8) |
| CsTe-15Pha.tdb | 301.33 | BCC_A2 (x(Te) 0) + ION (x(Te) 7.200e-4) + CS2TE_LT (x(Te) 0.33333) |

Convex hulls: [Materials Project DFT hull](https://data.orchid-project.org/hulls/dft-mp/CS/CS-TE.json) · [OQMD DFT hull](https://data.orchid-project.org/hulls/dft-oqmd/CS/CS-TE.json)

## Invariant reactions (literature)

Table: Invariant reactions reported in the literature for the Cs–Te system (12)

| T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote |
|---:|---|---|---|---|---|---|
| 1093 | congruent melting: β-Cs2Te -> L | β-Cs2Te: Cs 0.666667, Te 0.333333; L: Cs 0.666667, Te 0.333333 | experimental | [1] Thi 2015; _cites Chuntonov 1982_ | Table 1, p. 3, row 2; `ORC-7DDVUB7P2Q` |  |
| 934 | peritectic: Cs5Te3 -> β-Cs2Te + L | Cs5Te3: Cs 0.625, Te 0.375; β-Cs2Te: Cs 0.666667, Te 0.333333 | experimental | [1] Thi 2015; _cites R 1995_ | Table 1, p. 3, row 3; `ORC-N342BTDTE5` |  |
| 895 | polymorphic: α-Cs2Te -> β-Cs2Te | α-Cs2Te: Cs 0.666667, Te 0.333333; β-Cs2Te: Cs 0.666667, Te 0.333333 | experimental | [1] Thi 2015; _cites R 1995_ | Table 1, p. 3, row 1; `ORC-NNMIAHL3BC` |  |
| 723 | peritectic: β-CsTe -> Cs5Te3 + L | β-CsTe: Cs 0.510204, Te 0.489796; Cs5Te3: Cs 0.625, Te 0.375 | experimental | [1] Thi 2015; _cites R 1995_ | Table 1, p. 3, row 5; `ORC-HHCGYSF2EN` |  |
| 673 | polymorphic: α-CsTe -> β-CsTe | α-CsTe: Cs 0.510204, Te 0.489796; β-CsTe: Cs 0.510204, Te 0.489796 | experimental | [1] Thi 2015; _cites R 1995_ | Table 1, p. 3, row 4; `ORC-KVN4EQ5SNJ` |  |
| 668 | congruent melting: Cs2Te3 -> L | Cs2Te3: Cs 0.4, Te 0.6; L: Cs 0.4, Te 0.6 | experimental | [1] Thi 2015; _cites Chuntonov 1982_ | Table 1, p. 3, row 7; `ORC-GRYTTBC6AU` |  |
| 618 | eutectic: CsTe + Cs2Te3 -> L | CsTe: Cs 0.510204, Te 0.489796; Cs2Te3: Cs 0.4, Te 0.6 | experimental | [1] Thi 2015; _cites R 1995_ | Table 1, p. 3, row 6; `ORC-A4YX2OKZ3M` |  |
| 536 | peritectic: CsTe4 -> Te + L | CsTe4: Cs 0.2, Te 0.8 | experimental | [1] Thi 2015; _cites Chuntonov 1982_ | Table 1, p. 3, row 10; `ORC-PGVAQDZDD2` |  |
| 536 | peritectic |  | experimental | [1] Thi 2015; _cites Chuntonov 1982_ | p. 3; `ORC-ZX4VMAHIDN` | “For the same reason, the invariant temperature 536 K measured by Chuntonov et al. \[16\] is attributed to the peritectic decomposition of CsTe4.” |
| 508 | peritectic: Cs2Te5 -> L + Cs2Te3 | Cs2Te5: Cs 0.285714, Te 0.714286; Cs2Te3: Cs 0.4, Te 0.6 | experimental | [1] Thi 2015; _cites Chuntonov 1982_ | Table 1, p. 3, row 8; `ORC-7JFIUPPMGK` |  |
| 498 | peritectic |  | experimental | [1] Thi 2015 | p. 3; `ORC-R6YZD26VNE` | “In the composition range of this peritectic reaction, Adamson and Leighty have reported an experimental temperature of 498 K.” |
| 488 | eutectic: CsTe4 + Cs2Te5 -> L | CsTe4: Cs 0.2, Te 0.8; Cs2Te5: Cs 0.285714, Te 0.714286 | experimental | [1] Thi 2015; _cites Chuntonov 1982_ | Table 1, p. 3, row 9; `ORC-LINHHNBAN3` |  |

## Formation enthalpies

Literature values in kJ/mol-atom where the per-atom basis is known. DFT columns: the lowest-energy entry at the same composition (Materials Project 2026.04.13, OQMD v1.8; different energy references, never averaged), from [dft_parity.json](https://data.orchid-project.org/literature/dft_parity.json).

Table: Enthalpies of formation, Cs–Te system (5)

| Phase | Compound | Value | T (K) | Class | MP DFT (kJ/mol-atom) | OQMD DFT (kJ/mol-atom) | Source | Location | Quote |
|---|---|---:|---:|---|---:|---:|---|---|---|
| Cs2Te | [Cs2Te](https://data.orchid-project.org/compounds/Cs2Te.html) | -120.467 kJ/mol-atom ± 1.06667 | 298.15 | experimental | -109.246 (mp-aaabgqtv) | -99.985 (oqmd-1343671) | [1] Thi 2015; _cites Cordfunke 1987_ [doi](https://doi.org/10.1016/0021-9614%2887%2990121-2) | Table 3, p. 4, row 1; `ORC-4IKMXI5UTB.3dd9ab` |  |
| Cs5Te3 | [Cs5Te3](https://data.orchid-project.org/compounds/Cs5Te3.html) | -117.775 kJ/mol-atom ± 1.0375 | 298.15 (>) | model | -107.426 (mp-aaacppvd) | -94.605 (oqmd-6410) | [1] Thi 2015; _cites SGTE 2010_ | Table 3, p. 4, row 6; `ORC-U7KZL2PX7B.ac75e5` |  |
| Cs5Te3 | [Cs5Te3](https://data.orchid-project.org/compounds/Cs5Te3.html) | -117.775 kJ/mol-atom ± 8300 | 298.15 | experimental | -107.426 (mp-aaacppvd) | -94.605 (oqmd-6410) | [1] Thi 2015; _cites R 1997_ | Table 3, p. 4, row 8; `ORC-ZEICEVWLP3` |  |
| Cs₂Te |  | -361.4 kJ/mol (basis unstated) ± 3.2 | 298.15 | experimental |  |  | [1] Thi 2015; _cites Cordfunke 1987_ [doi](https://doi.org/10.1016/0021-9614%2887%2990121-2) | Table 3, p. 4, row 1; `ORC-4IKMXI5UTB.a6b180` |  |
| Cs₅Te₃ |  | -942.2 kJ/mol (basis unstated) ± 8.3 | 298.15 (>) | model |  |  | [1] Thi 2015; _cites SGTE 2010_ | Table 3, p. 4, row 6; `ORC-U7KZL2PX7B.339d56` |  |

## Other properties

### Phase transition (10)

Table: Phase transition, Cs–Te system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Phase transition | 393 K | 393 | CsTe4 | experimental | [1] Thi 2015 | p. 2; `ORC-7IGD572OZK.c86f25` | “The existence of CsTe4 is confirmed and structural transitions in this compound are identified at 393 K and 498 K.” |
| Phase transition | 498 K | 498 | CsTe4 | experimental | [1] Thi 2015 | p. 2; `ORC-7IGD572OZK.d4c6a2` | “The existence of CsTe4 is confirmed and structural transitions in this compound are identified at 393 K and 498 K.” |
| Phase transition | 508 K | 508 | Cs2Te5 | experimental | [1] Thi 2015 | p. 3; `ORC-ZWENWRWVWB` | “Cs2Te5 melts incongruently at 508 K.” |
| Phase transition | 515 K | 515 | other | experimental | [1] Thi 2015 | p. 3; `ORC-6VR6ZJQGUA` | “A second order transition in Cs5Te3 is observed around 515 K.” |
| Phase transition | 668 K | 668 | Cs2Te3 | experimental | [1] Thi 2015; _cites Chuntonov 1982_ | p. 2; `ORC-2KZRYTUDDN.78bdcd` | “- The melting of Cs2Te3 was found at 668 K in \[16\] instead of 707 K in \[14\].” |
| Phase transition | 668 K | 668 | Cs2Te3 | experimental | [1] Thi 2015; _cites Chuntonov 1982_ | p. 3; `ORC-ULO6Q27DXY` | “The melting temperature 668 K of Cs2Te3 is taken from Chuntonov et al. \[16\].” |
| Phase transition | 707 K | 707 | Cs2Te3 | experimental | [1] Thi 2015; _cites Adamson 1983_ [doi](https://doi.org/10.1016/0022-3115%2883%2990272-6) | p. 2; `ORC-2KZRYTUDDN.f5e8b8` | “- The melting of Cs2Te3 was found at 668 K in \[16\] instead of 707 K in \[14\].” |
| Phase transition | 707 K | 707 | Cs2Te3 | experimental | [1] Thi 2015 | p. 3; `ORC-N4JXBSAIE2` | “As already mentioned for the high Te alloy, this value is judged more reliable than the measurement of Adamson and Leighty (707 K).” |
| Phase transition | 953 K | 953 | congruent transformation | experimental | [1] Thi 2015; _cites Bergmann 1937_ [doi](https://doi.org/10.1002/zaac.19372310306) | p. 2; `ORC-RLKGUMW3WM` | “In 1937, Bergmann \[27\] reported a congruent melting point of Cs2Te at 953 K which is nowadays judged as a too low value.” |
| Phase transition | 1093 K | 1093 | congruent transformation | experimental | [1] Thi 2015; _cites Chuntonov 1982_ | p. 3; `ORC-DWNWTHAEUS` | “Cs2Te presents a structural transition at 895 72 K \[17\] and congruent melting at 1093 K measured by Chuntonov et al. \[16\].” |

### Heat capacity / entropy / enthalpy (5)

Table: Heat capacity / entropy / enthalpy, Cs–Te system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Entropy; _printed: S0_ | 61.7 J/mol-atom/K | 298.15 | Cs2Te; _alloy: Te 0.333333_ | experimental | [1] Thi 2015; _cites Cordfunke 1987_ [doi](https://doi.org/10.1016/0021-9614%2887%2990121-2) | Table 3, p. 4, row 2; `ORC-LEVZKAYSFQ.3928ec` |  |
| Entropy; _printed: S0_ | 60 J/mol-atom/K ± 0.625 | 298.15 | Cs5Te3; _alloy: Te 0.375_ | model | [1] Thi 2015; _cites R 1997_ | Table 3, p. 4, row 9; `ORC-QZ3LEPVT3V.0c0c74` |  |
| Entropy; _printed: S0_ | 480 unknown ± 5 | 298.15 | Cs5Te3; _alloy: Te 0.375_ | model | [1] Thi 2015; _cites R 1997_ | Table 3, p. 4, row 9; `ORC-QZ3LEPVT3V.4d8895` |  |
| Entropy; _printed: S0_ | 185.1 J/mol (basis unstated)/K | 298.15 | Cs₂Te; _alloy: Te 0.333333_ | experimental | [1] Thi 2015; _cites Cordfunke 1987_ [doi](https://doi.org/10.1016/0021-9614%2887%2990121-2) | Table 3, p. 4, row 2; `ORC-LEVZKAYSFQ.98da47` |  |
| Entropy; _printed: S0_ | 480 J/mol (basis unstated)/K ± 5 | 298.15 | Cs₅Te₃; _alloy: Te 0.375_ | model | [1] Thi 2015; _cites R 1997_ | Table 3, p. 4, row 9; `ORC-QZ3LEPVT3V.9b58c1` |  |

### Activity / EMF / Gibbs energy (2)

Table: Activity / EMF / Gibbs energy, Cs–Te system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Vapour pressure; _printed: P(Cs)/P(Cs2Te2)_ | 1 unspecified | 1105 | Cs2Te | experimental | [1] Thi 2015; _cites Ball 1992_ | p. 5; `ORC-H4H37GHIIT.f51fd2` | “at 1146 K with the results of Drowart and Smoes at 1105 K, the maximum temperature reached in their experiments, some discrepancies are denoted: - The three major species in \[44\] are Cs, Cs2Te2 and Te with a ratio P(Cs)/P(Cs2Te2)E 2.5, the other minor species being CsTe2, CsTe, Te3, Cs2Te and Te2 by order of decreasing abundance, - The three major species in \[30\] are Cs, Cs2Te2 and CsTe with a ra…” |
| Vapour pressure; _printed: P(Cs)/P(Cs2Te2)_ | 2.5 unspecified | 1146 | Cs2Te | experimental | [1] Thi 2015; _cites Portman 1989_ [doi](https://doi.org/10.1016/0040-6031%2889%2985081-6) | p. 5; `ORC-H4H37GHIIT.c652e2` | “Comparing the results obtained by Portman et al. at 1146 K with the results of Drowart and Smoes at 1105 K, the maximum temperature reached in their experiments, some discrepancies are denoted: - The three major species in \[44\] are Cs, Cs2Te2 and Te with a ratio P(Cs)/P(Cs2Te2)E 2.5, the other minor species being CsTe2, CsTe, Te3, Cs2Te and Te2 by order of decreasing abundance,” |

### Crystal structure (22)

Table: Crystal structure, Cs–Te system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Lattice a | 5.2 Å |  | β-CsTe; _β-CsTe: Cs 0.509, Te 0.491_ | experimental | [1] Thi 2015; _cites R 1995_ | Table 2, p. 4, row 6; `ORC-Y4HTYWXQP6` |  |
| Lattice a | 8.666 Å | 298.15 | Cs2Te3; _Cs2Te3: Cs 0.4, Te 0.6_ | experimental | [1] Thi 2015; _cites Bottcher 1980_ [doi](https://doi.org/10.1016/0022-5088%2880%2990235-0) | Table 2, p. 4, row 8; `ORC-543HFMVFMO.6d4736` |  |
| Lattice a | 9.37 Å | 298.15 | Cs2Te5; _Cs2Te5: Cs 0.286, Te 0.714_ | model | [1] Thi 2015; _cites Kretschmann 1982_ [doi](https://doi.org/10.1002/zaac.19824910106) | Table 2, p. 4, row 9; `ORC-QCLBJ43KGX.ecfd9e` |  |
| Lattice a | 7.857 Å | 298.15 | CsTe4; _CsTe4: Cs 0.2, Te 0.8_ | unspecified | [1] Thi 2015; _cites Bottcher 1985_ [doi](https://doi.org/10.1002/zaac.19855230418) | Table 2, p. 4, row 10; `ORC-W7KE2GKPPV.33487b` |  |
| Lattice a | 9.109 Å | 298.15 | α-Cs2Te; _α-Cs2Te: Cs 0.667, Te 0.333_ | model | [1] Thi 2015; _cites Maeda 1994_ | Table 2, p. 4, row 3; `ORC-CVM7TZZOE7.fdea7b` |  |
| Lattice a | 21.11 Å | 298.15 | α-Cs5Te3; _α-Cs5Te3: Cs 0.625, Te 0.375_ | experimental | [1] Thi 2015; _cites R 1995_ | Table 2, p. 4, row 5; `ORC-3BGJYAIYJ3.203425` |  |
| Lattice a | 11.1639 Å | 298.15 | α-CsTe; _α-CsTe: Cs 0.509, Te 0.491_ | experimental | [1] Thi 2015; _cites R 1995_ | Table 2, p. 4, row 7; `ORC-VZYYRYIVIT.3ad976` |  |
| Lattice b | 12.065 Å | 298.15 | Cs2Te3; _Cs2Te3: Cs 0.4, Te 0.6_ | experimental | [1] Thi 2015; _cites Bottcher 1980_ [doi](https://doi.org/10.1016/0022-5088%2880%2990235-0) | Table 2, p. 4, row 8; `ORC-543HFMVFMO.a356d7` |  |
| Lattice b | 12.28 Å | 298.15 | Cs2Te5; _Cs2Te5: Cs 0.286, Te 0.714_ | model | [1] Thi 2015; _cites Kretschmann 1982_ [doi](https://doi.org/10.1002/zaac.19824910106) | Table 2, p. 4, row 9; `ORC-QCLBJ43KGX.f21a21` |  |
| Lattice b | 7.286 Å | 298.15 | CsTe4; _CsTe4: Cs 0.2, Te 0.8_ | unspecified | [1] Thi 2015; _cites Bottcher 1985_ [doi](https://doi.org/10.1002/zaac.19855230418) | Table 2, p. 4, row 10; `ORC-W7KE2GKPPV.79efa4` |  |
| Lattice b | 11.486 Å | 298.15 | α-Cs2Te; _α-Cs2Te: Cs 0.667, Te 0.333_ | model | [1] Thi 2015; _cites Maeda 1994_ | Table 2, p. 4, row 3; `ORC-CVM7TZZOE7.b9b35f` |  |
| Lattice b | 6.655 Å | 298.15 | α-Cs5Te3; _α-Cs5Te3: Cs 0.625, Te 0.375_ | experimental | [1] Thi 2015; _cites R 1995_ | Table 2, p. 4, row 5; `ORC-3BGJYAIYJ3.6c2bb4` |  |
| Lattice b | 6.1309 Å | 298.15 | α-CsTe; _α-CsTe: Cs 0.509, Te 0.491_ | experimental | [1] Thi 2015; _cites R 1995_ | Table 2, p. 4, row 7; `ORC-VZYYRYIVIT.47e415` |  |
| Lattice c | 8.68 Å | 298.15 | Cs2Te3; _Cs2Te3: Cs 0.4, Te 0.6_ | experimental | [1] Thi 2015; _cites Bottcher 1980_ [doi](https://doi.org/10.1016/0022-5088%2880%2990235-0) | Table 2, p. 4, row 8; `ORC-543HFMVFMO.cbf4b8` |  |
| Lattice c | 10.12 Å | 298.15 | Cs2Te5; _Cs2Te5: Cs 0.286, Te 0.714_ | model | [1] Thi 2015; _cites Kretschmann 1982_ [doi](https://doi.org/10.1002/zaac.19824910106) | Table 2, p. 4, row 9; `ORC-QCLBJ43KGX.41b81a` |  |
| Lattice c | 14.155 Å | 298.15 | CsTe4; _CsTe4: Cs 0.2, Te 0.8_ | unspecified | [1] Thi 2015; _cites Bottcher 1985_ [doi](https://doi.org/10.1002/zaac.19855230418) | Table 2, p. 4, row 10; `ORC-W7KE2GKPPV.d58c93` |  |
| Lattice c | 5.867 Å | 298.15 | α-Cs2Te; _α-Cs2Te: Cs 0.667, Te 0.333_ | model | [1] Thi 2015; _cites Maeda 1994_ | Table 2, p. 4, row 3; `ORC-CVM7TZZOE7.ee0d96` |  |
| Lattice c | 15.07 Å | 298.15 | α-Cs5Te3; _α-Cs5Te3: Cs 0.625, Te 0.375_ | experimental | [1] Thi 2015; _cites R 1995_ | Table 2, p. 4, row 5; `ORC-3BGJYAIYJ3.d06e95` |  |
| Lattice c | 4.9669 Å | 298.15 | α-CsTe; _α-CsTe: Cs 0.509, Te 0.491_ | experimental | [1] Thi 2015; _cites R 1995_ | Table 2, p. 4, row 7; `ORC-VZYYRYIVIT.1653cd` |  |
| lattice beta | 93.83 ° | 298.15 | CsTe4; _CsTe4: Cs 0.2, Te 0.8_ | unspecified | [1] Thi 2015; _cites Bottcher 1985_ [doi](https://doi.org/10.1002/zaac.19855230418) | Table 2, p. 4, row 10; `ORC-W7KE2GKPPV.2a1bd0` |  |
| lattice beta | 134.53 ° | 298.15 | α-Cs5Te3; _α-Cs5Te3: Cs 0.625, Te 0.375_ | experimental | [1] Thi 2015; _cites R 1995_ | Table 2, p. 4, row 5; `ORC-3BGJYAIYJ3.e017e2` |  |
| lattice gamma | 90 ° |  | β-Cs5Te3; _β-Cs5Te3: Cs 0.625, Te 0.375_ | experimental | [1] Thi 2015; _cites R 1995_ | Table 2, p. 4, row 4; `ORC-HTUYURGMGM` |  |

### Other property (2)

Table: Other property, Cs–Te system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Transition enthalpy; _printed: Enthalpy of α/β transition of Cs2Te_ | 1950 J/mol ± 230 |  | Cs₂Te; _alloy: Te 0.333333_ | experimental | [1] Thi 2015; _cites R 1995_ | Table 3, p. 4, row 4; `ORC-Z4VT4RIBLF.6cdd73` |  |
| Transition enthalpy; _printed: Enthalpy of melting of β-Cs2Te_ | 7100 J/mol ± 1000 |  | β-Cs₂Te; _alloy: Te 0.333333_ | experimental | [1] Thi 2015; _cites R 1995_ | Table 3, p. 4, row 5; `ORC-VLWZ7S56WI.194fa3` |  |

## Sources

Reporting papers the values were read from (a value cited from another work names that work in its row).

1. T.-N. Pham Thi, J.-C. Dumas, V. Bouineau, N. Dupin, C. Guéneau, S. Gossé et al., Thermodynamic assessment of the Cs–Te binary system, Calphad 48, 1-12 (2015). [doi:10.1016/j.calphad.2014.10.006](https://doi.org/10.1016/j.calphad.2014.10.006)

## Please cite

- R. Arróyave, J. Saal, D. Shin, ORCHID-Values: thermodynamic and phase-equilibrium values read from the literature (version 2026.10; Version 1, machine-extracted), Zenodo (2026). https://doi.org/10.5281/zenodo.23735569
- R. Arróyave, J. Saal, D. Shin, ORCHID-Diagrams: calculated binary phase diagrams (version 2026.10), Zenodo (2026). https://doi.org/10.5281/zenodo.23735859
- R. Arróyave, J. Saal, D. Shin, ORCHID-Hulls: binary convex hulls (Materials Project, OQMD, assessed CALPHAD) (version 2026.10), Zenodo (2026). https://doi.org/10.5281/zenodo.23735891
- R. Arróyave, J. Saal, D. Shin, ORCHID data: umbrella record of the ORCHID datasets (version 2026.10; Version 1, machine-extracted), Zenodo (2026). https://doi.org/10.5281/zenodo.23736065

Also cite the original source of every value you use (paper_citation / paper_doi, and cited_dois for values the paper cites from earlier work); B. Hallstedt, The SGTE collection of binary datasets, Calphad 89 (2025) 102833, https://doi.org/10.1016/j.calphad.2025.102833 (CC BY 4.0), and the original assessment named in each file; A. Jain et al., The Materials Project: A materials genome approach to accelerating materials innovation, APL Materials 1 (2013) 011002, https://doi.org/10.1063/1.4812323 (CC BY 4.0); J. E. Saal et al., JOM 65 (2013) 1501, https://doi.org/10.1007/s11837-013-0755-4 and S. Kirklin et al., npj Comput. Mater. 1 (2015) 15010, https://doi.org/10.1038/npjcompumats.2015.10 (CC BY 4.0).

Version 1, machine-extracted: values were read by language-model readers constrained to quote their source and checked automatically, and the release was then audited on the printed pages by adversarial audits, an independent second review of fit-facing records and a preliminary human review of a frozen sample. Flags such as accepted and ESPEI-ready record screening results, not certification; known issues are listed in the release notes.

```bibtex
@misc{orchid_literature_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Values: thermodynamic and phase-equilibrium values read from the literature}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735569},
  url       = {https://doi.org/10.5281/zenodo.23735569},
  note      = {Version 1, machine-extracted}
}

@misc{orchid_phase_diagrams_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Diagrams: calculated binary phase diagrams}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735859},
  url       = {https://doi.org/10.5281/zenodo.23735859}
}

@misc{orchid_hulls_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Hulls: binary convex hulls (Materials Project, OQMD, assessed CALPHAD)}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735891},
  url       = {https://doi.org/10.5281/zenodo.23735891}
}

@misc{orchid_data_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID data: umbrella record of the ORCHID datasets}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23736065},
  url       = {https://doi.org/10.5281/zenodo.23736065},
  note      = {Version 1, machine-extracted}
}
```

---

Derived data CC BY 4.0 ([licence](https://creativecommons.org/licenses/by/4.0/)): cite ORCHID ([CITATION.cff](https://data.orchid-project.org/CITATION.cff)) and the original sources. Quotes are short excerpts kept so that each value can be checked; they remain under the publishers' copyright and are not relicensed. Source papers, page images and full text are not redistributed. Field reference: [SCHEMA.md](https://data.orchid-project.org/literature/SCHEMA.md). Machine-readable guide: [llms.txt](https://data.orchid-project.org/llms.txt). Found an error? The report link of a value (Markdown: its id, ORC-..., in the Location column) opens a pre-filled GitHub issue, https://github.com/orchid-calphad/orchid-data/issues/new?template=report-value-error.yml&record_id=\<id>, carrying only the record id, source and value; [how to contribute](https://orchid-project.org/contribute/).